Loom shuttle



March 31, 1931. w. l. s'H PsoN 1,793,178

LOOM SHUTTLE Filed July 51, 1929 2 Sheets-Sheet 1 ATTORNEY March 31,1931. w. STIMPSON 1,793,178

LOOM SHUTTLE Filed July 31, 1929 2 Sheets-Sheet 2 A TTORNEY PatentedMar. 31, 1931- UNITED srA'rs T E T FFicE WALLACE I. STIMPSON, 0FHOPEDALE, MASSACHUSETTS, ASSIGNOR TO'IJRAPER COR- PORATION, OF HOPEDALE,MASSACHUSETTS, A CORPORATION OF MAINE LOOM snuTrLn' Application filedJuly 31, 1929. Serial No. 382,509.

This invention relates to loom shuttles of the automatic weftreplenishing type and is more particularly directed to the bobbinholding end of such shuttles.

t is now the ordinary. practice to provide automatic weft replenishingshuttles with bobbin holding jaws for detachable engagement with thehead or rings of a filling carrier or bobbin and to associate withthejaws a bobbin or filling carrier guide.

During replenishment the i'ncoming'filling carrier or bobbin serves toeject the filling carrier or bobbin previously in the shuttle, andduring this operation the bobbin holding jaws and the associated partsthereof are subject to sudden and destructive strains which frequentlyresult in breakage of parts.

It has likewise been common heretofore to form the bobbin holding jawswith a shank portion bent upon itself and to secure the shank portion tothe shuttle body by a transverse bolt. 7

The wood of the shuttle is obviously somewhat yielding and when the boltis set up. to

hold the shank and bobbin holding jaws in position, the shank portion isliable tobe distorted, so it has been suggested heretofore that the sidewalls of the shank portion be held apart by a spacer which sometimesconsists of a block of metal or similar separate part.

In certain aspects the present invention is a further development andimprovement over the construction shown and described in the Edward S.Stimpson Patent, No. 1,082,049, December 23, 1913.

When the bobbin holding jaws are separated by the incoming bobbin orfilling carrier, the latter is liable to have its tip end portiondepressed to such a degree as not to return to proper position in theshuttle, with the result that during the flight of the shuttle throughthe shed, warp threads are liable to be broken, and a further feature ofthe present invention consists in a construction of the bobbin holdingjaws whereby the tipward ring on the head of the bobbin will be causedto first engage the end of the bobbin holding jaws and properly positionthe bobbin as it is transferred to the shuttle.

The invention and-novel features thereof will best be made clearfrom'the following description and the accompanying drawings of one goodform thereof. 7

In the" drawings: 1

Fig. 1 is a perspective view of the bobbin holding jaws, and shankportion constructed in accordance with the present invention;

Fig. 2' is a perspective view of the bobbin guide and the featuresassociated therewith for maintaining the side walls of the shank portionof the bobbin holding jaws from distortion; I

Fig. 3 is a perspective view of one end of the shuttle, showing theparts as being assembled; and 7 Fig.4 is a sectional side elevationofone end of theshuttle showing the relation of parts during the transferof a bobbin to the shuttle. v

' Figs. 5 and 6 show a modification,

The shuttle comprises the body portion 1 having the usual bobbin chamber2 and provided at one end with a shank receiving chamber S.' The chamber3 isformed in the wood of the shuttle'and the upper portion is enlargedor widened, as at 4:, thereby forming a shelf or shoulder 5in theshuttle wood at the top of the shank receiving chamber, and at thebottom of the shank receiving chamber the shuttle is formed with acut-out portion 6 of a size and character to receive the bottom plate ofthe bobbin guide, as will later appear.

he bobbin holder is characterized by the shank portion 7' which is bentupon itself, as at 8, and from the forward portion of the shank extendthe bobbin jaws 9 and 10, each of which may be provided with the usualbobbin engaging grooves Y11 and bevelled upper portion 12 for the moreready entrance of the bobbin holding rings into the grooves of thebobbin holding jaws.

The wall of the shank portion 7 is provided with an opening 13 throughwhich-is passed the transverse bolt 14, as usual, and between the bobbinholding jaws 9 and 10 is the bobbin guide 15, having a top plate 16.

and a bottom plate 17 which embrace bethe transverse bolt 14 and 17 isshown as provided with laterally extending wings adapted to enter theside walls of the shuttle.

As shown, a through-bolt 18 extends through a suitable opening in thetop plate of the bobbin guide and through a similar opening in thebottom plate of the bobbin guide, and it is secured in place at itslower end by a nut 19, in which respect this feature of the inventionmay be substantially the same as that shown and ent of Wallace I.Stimpson and Harry Davis, No. 1,571,149, January 26, 1926.

As hereinbefore noted,.it is desirable to maintain the side the bobbinholder in their proper separated relation under the stress of thetransverse bolt 14 and during shuttle replenishment. To this end thebobbinguide 15 has its top plate 16 provided with a downwardly eX-tending integral tongue 20 which may be conveniently formed of a size tomaintain the side walls ofthe shank separated by punching out the'topplate, as indicated in Fig. 2, and bending the integral tongue 20downwardly to occupy and fit the space between the side walls of theshank. Likewise,

the bottom plate 17 of the bobbin guide is provided with an integraltongue 21 which may be appropriately formed by punching the bottomplate, as indicated in Fig. 2, and bending. or turning the tongueupwardly.

The two tongues 20. and 21, it will be noted, converge towards eachother and the bobbin guide 15, as indicated in Fig. 4, so that their endportions are in close proximity, and said tongues likewise occupy thespace between the side walls of the shank 7, thereby bracing said wallsboth at their top and bottom portions, or substantially throughout theheight of the shank. This is of importance because during thereplenishing operation the top part of the bobbin holding jaws is firstengaged by. the bobbin or filling carrier and is liable to efi'ect atwisting action or displacement of the side walls of the shank 7 whichtendency is counteracted by the two integral tongues which actsubstantially throughout the height of the side walls of the shank.

Since one of the main purposes of the integral tongues 20 and 21 is tomaintain the side walls of theshank in their proper, re lated positions,notwithstanding the stress of the changing stresses of transfer, it ispreferable that the integral tongues 20 and 21 be formed upon the topand bottom plates respectively at a point substantially above and belowthe transversebolt 14, and, as shown inthe present instance of theinvention, the bends of the tongues 20 and 21 are approximately aboveand below the transverse bolt, and their free ends are inclinedconvergingly into the space described'in the patshank 7.

walls of the shank 7 of between the side walls of the shank and towardsthe bobbin guide 15.

The bobbin holding jaws 9 and 10 con stit-ute novel feature of theinvention, and, as will be noted from Figs. 1 and 4, the top edgeportions 22 of each jaw are cut on a straight incline downwardly fromthe terminal portion 23 of the shank 7 and are then upwardly inclined.at 24 to the terminal end of each jaw, so that the a terminal end ofeach bobbin holding jaw, at 25, isat the same height as the top edgeportion of the lVhere the straight inclines 22 and 24 meet, as indicatedin Fig. 1, there is formed a yielding or spring zone 26 about ingtransfer. v

When .a filling carrieror bobbin such .as indicated by dotted lines inFig. 4 is trans fer'red to the shuttle, the forward ring on the bobbinhead first engages at or near minal endportions of thebobbin holdingjaws, and following t-his'the other rings of the bobbin head engage thejaws, so, that the bobbin takes substantially the position indicated bydotted lines in Fig. 4, with the top of the bobbin slightly elevated,thereby preventing depression of'the bobbin tip as it is transferredtothe shuttle,

lVhen the oarts are in assembled Josition' as indicated in Fig. 4, theintegral tongues 20 and 21 effectively maintain the walls of theshank-in their proper, separated relation, substantially throughout theheight of said walls, and on transfer the integral tongues act toprevent distortion of the side walls of the shank due to any twisting orsudden impulse. Owing to the straightinclines 22 and 24 thes rin zone 26'afiords sufficient yield-at an appropriate position frontjvard oftheterminaliends of the shank and preferably midway between the terminalends'of the shank and the terminal ends of the jaws'about which the jawsmay yield as a filling carrier is transferred to the shuttle.

In Figs. 5 and 6 a modification of the invention shows the integraltongues extending downwardly from the top plateand upwardly from thebottom verging towards the transverse securing bolt. In suchmodification the tongue 30 extending downwardly from the top plate 16has its terminal end portion 31 close to and above the securing bolt 14,while the tongue 32 extending upwardly from the bottom plate has theterminal end 33 thereof close to and below the securing bolt 14, withthe result that in this modification of the invention the terminal endsof the tongues brace and support the side walls of the shank 7 at thepoint of greatest strain. As shown, the ter minal ends of the upper andlower surfaces of the securing bolt 14, but this may not always benecessary which the'bobbinholding jaws may'yield durthe ter-v platein adirection conthe two tongues contact with so long as the tongues formedintegral with the top and bottom plates 16 and 17 respectively and bentdownwardly and upwardly therefrom, brace and sustain the side walls ofthe shank substantially throughout the height thereof.

The constructions described afford a cheap and easily manufactured bracefor the side walls of the shank substantially throughout the heightthereof and obviate the disadvantages incident to a spacer block orsimilar element formed independent of the top and bottom plates of thebobbin guide.

What is claimed is:

An automatic weft-replenishing loom shuttle having, in combination,resilient bobbin-holding jaws formed with a -U-shaped shank portion, aretaining bolt extending horizontally through theshuttle body and shankportion of the jaws and the bobbin receiving portion of each jaw havingitsfiupper edge inclined sufiiciently to cause-the ring nearest the tipof the incoming'bobbin to contact first with the jaws, a bobbin guidebetween the jaws having a top plate and bottom plate formed withsupporting wings, and means for preventing thelbobbin-holding jaws frombeing sprung inwardly by the clamping action of thehorizontallyextending bolt, comprising a tongue formed in tergral withthe top plate and bent down wardly between the side walls of the shankto brace the upper portion thereof, a second tongue formed integral withthe bottom plate and bent upwardly between the side walls of the shanktowards the first tongue to brace the lower portion thereof, and thetongues being disposed in spaced relation to said bolt to hold the jawsin spaced parallel relation to each other and at the same time so thatthey are free to spring to receive the incoming bobbin.

In testimony whereof, I have signed vmy name to this specificatlon.

WALLACE I. STIMPSON.

